The big thing that ArchiveBox can't do, and the Internet Archive can, is attest to the accuracy of the archive. Being at least able to prove that the archive was created in the past, prior to there being a reason to tamper it, is the best we can realistically do with current cryptography. So it'd be really good if support for timestamping was added.
IIUC ArchiveBox is written in Python; OTS has a Python library that should work fine for you: https://github.com/opentimestamps/python-opentimestamps